Is Rosalina's dress suppose to be blue/pink? Just something small that I noticed.

I did change the shading on the white parts of the dress from gray to a pinkish-purple, but if you think it's too saturated I can either dull it out or change it back.

It's looking Great!
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Try to fix that Head

While you're at that, the hair seems strange.

Better?

Also, what do you feel needs to be changed with the head?

Hm... You are improving, but I recomend you try diferent things to realize diferent concepts and become better.
I'll suggest you do 5 to 10 poses of any character (same character all the poses) and see how you can go with them. If you want an example, look my post in that same forums where I have Diddy Kong, Little Mac and Mr Game and Watch concept sheets

Maybe will be good for you learn more about the source of information that it's drawing. Yyou can look tutorials and try improve your drawing skills.

Well, I know I'm capable of sheeting, I'm just trying to get the base sprite as perfect as possible before I start doing different poses. I'm starting to sheet Luma already (tho obviously that's a really basic character), so I'll post my progress soon. In fact, I'll sprite one of Rosalina's moves, too, just to sprite her in a few different poses.

Just a edit to your Rosalina, hope you like. Some of the things the other appointed and more like the SSB4 incarnation. Changes: Better shading, a hole to the star in her hand, a bit taller, fixed face and hair, fixed white things, fixed dress, yellow button more similar to Mario's and crown with more details.